:-/ My PH stays around 7.9 and my nitrates are high. My calcium level is good and my nitrites ,ammonia, and phosphates are low.I did partial water changes.i've been using Kent Superbuffer to get my PH at/around 8.3. The local pet store was baffled, and we looked through numerous books. I have a 55 Gal. tank with 9 small fish,snails, and a few coral fragments. I also have numerous macro algae , and saltwater plants in my tank. 1. How do I get my PH to 8.3? 2. Lower my nitrates? 3. My calcium level is high,but can't get coralline algae to grow ( high nitrates causing green algae to coat live rocks)??? any help would be appreciated..